Texas Instruments TMS320 - page 26

TMS32020

SPRS010B— MAY 1987— REVISED NOVEMBER 1990

POST OFFICE BOX 1443 •HOUSTON, TEXAS 77001

26

SERIAL PORT TIMING

switching characteristics over recommended operating conditions (see Note 3)

PARAMETER MIN TYP MAX UNIT

td(CH-DX) DX valid after CLKX rising edge (see Note 10) 100 ns

td(FL-DX) DX valid after FSX falling edge (TXM = 0, see Note 10) 50 ns

td(CH-FS) FSX valid after CLKX rising edge (TXM = 1) 60 ns

NOTES: 3. Q = 1/4tc(C).

10. The last occurrence of FSX falling and CLKX rising.

timing requirements over recommended operating conditions (see Note 3)

MIN NOM MAX UNIT

tc(SCK) Serial port clock (CLKX/CLKR) cycle time 390 20 000†ns

tf(SCK) Serial port clock (CLKX/CLKR) fall time 50‡ns

tr(SCK) Serial port clock (CLKX/CLKR) rise time 50‡ns

tw(SCK) Serial port clock (CLKX/CLKR) low pulse duration (see Note 11) 150 12 000 ns

tw(SCK) Serial port clock (CLKX/CLKR) high pulse duration (see Note 11) 150 12 000 ns

tsu(FS) FSX/FSR setup time before CLKX/CLKR falling edge (TXM = 0) 20 ns

th(FS) FSX/FSR hold time after CLKX/CLKR falling edge (TXM = 0) 20 ns

tsu(DR) DR setup time before CLKR falling edge 20 ns

th(DR) DR hold time after CLKR falling edge 20 ns

†Value derived from characterization data; minimum fsx at test = 825 kHz.

‡Value derived from characterization data and not tested.

NOTES: 3. Q = 1/4tc(C).

11. The duty cycle of the serial port clock must be within 40-60%.

ADVANCE INFORMATION

Contents

Main TMS320 SECOND-GENERATION DIGITAL SIGNAL PROCESSORS TMS320 SECOND-GENERATION PGA AND PLCC/CER-QUAD PIN ASSIGNMENTS TMS320 SECOND-GENERATION DEVICES description introduction Page TMS320 SECOND-GENERATION DEVICES architecture SPRS010B MAY 1987 REVISED NOVEMBER 1990 functional block diagram (TMS320C2x) TMS320 SECOND-GENERATION DEVICES SPRS010B MAY 1987 REVISED NOVEMBER 1990 Figure 1. Memory Maps 8 (a) Memory Maps After a CNFD Instruction (b) Memory Maps After a CNFP Instruction Program Program Data TMS320 SECOND-GENERATION DEVICES instruction set Page Table 3. TMS320C25 Instruction Set Summary Page Page Page Table 3. TMS320C25 Instruction Set Summary (concluded) Page development support TMS320 Family Development Support Reference Guide Table 4. TMS320 Second-Generation Software and Hardware Support TMS320 Family Development Support Reference Guide TMS320 SECOND-GENERATION documentation support specification overview Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies internal clock option mode, and parallel resonant, with an effective series resistance of 30 external clock option Figure 3. Test Load Circuit Figure 4. Voltage Reference Levels Page switching characteristics over recommended operating conditions (see Note 3 and 8) timing requirements over recommended operating conditions (see Note 3 and 8) Page Page internal clock option or overtone mode, and parallel resonant, with an effective series resistance of 30 Hardware Interfacing to the TMS320C25 external clock option Hardware Interfacing to the TMS320C25 (document number SPRA014A) for details on circuit operation. Figure 4. Test Load Circuit Figure 5. Voltage Reference Levels switching characteristics over recommended operating conditions (see Note 3 and 8) timing requirements over recommended operating conditions (see Note 3 and 8) TMS320C25, TMS320E25 EPROM PROGRAMMING electrical characteristics over specified temperature range (unless otherwise noted) recommended timing requirements for programming, TA = 25C, VCC = 6 V, VPP = 12.5 V (see Notes 14 and 15) Page Page Figure 7. External Clock Option Page switching characteristics over recommended operating conditions (see Notes 3 and 16) timing requirements over recommended operating conditions (see Notes 3 and 16) CONTRAST SUMMARY OF ELECTRICAL SPECIFICATIONS Page TIMING DIAGRAMS clock timing memory read timing memory write timing one wait-state memory access timing reset timing interrupt timing (TMS32020) interrupt timing (TMS320C25) serial port receive timing serial port transmit timing BIO timing external flag timing BIO timing external flag timing HOLD timing (part A) HOLD timing (part B) HOLD timing (part A) HOLD timing (part B) TYPICAL SUPPLY CURRENT CHARACTERISTICS FOR TMS320C25 TMS320C25FNL (PLCC) reflow soldering precautions no MECHANICAL DATA 68-pin GB grid array ceramic package (TMS32020, TMS320C25) 68-lead plastic leaded chip carrier package (TMS320C25 and TMS320C25-50) WARNING When reflow soldering is required, refer to page 54 for special handling instructions. MECHANICAL DATA 68-lead FZ CER-QUAD, ceramic leaded chip carrier package (TMS320E25 only) programming the TMS320E25 EPROM cell Pin Nomenclature (TMS320E25) Figure 9. TMS320E25 EPROM Conversion to TMS27C64 EPROM Pinout Page Figure 10. Fast Programming Flowchart Page Page Page Figure 13. EPROM Protect Timing Page Page PACKAGING INFORMATION PACKAGE OPTION ADDENDUM IMPORTANT NOTICE